Wow, and I was beginning to think I was strange for putting a hitch and harness on my Focus, all of my friends laughed at the idea.
I use it for hauling a 4x8 trailer, makes runs to the lumber yard much easier.
I can confirm all of the wiring colors are the same for 02 sedan.
orange (or orange w/white stripe)- tail lights
blue/red - right turn
blue - left turn
green w/red stripe (or green w/black stripe) - Stop
black - ground
Don't forget, you will need a 3-to-2 wire converter since the brake and turn lamps are separate, like this one
from eTrailer. This one uses the power already supplied to the stop/turn/tail lamps to power the trailer, also. This works fine for a small trailer with only a single fixture on each side for tail/stop and maybe one side marker on each side. If your trailer has more lights, you'll need a powered controller, like this one